Respiration

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Across
  1. 2. divides into two, one branch to each lung
  2. 4. the water part of blood that carries carbon dioxide
  3. 7. oxygen burns this to release energy
  4. 9. the purpose of respiration is to release this
  5. 10. small air sac in the lungs
  6. 13. the organ system that involves breathing
  7. 15. the process that moves gases in and out of the blood
  8. 16. this cage-like structure moves in the chest when breathing
  9. 17. needs to get into bloodstream to be carried to cells
  10. 18. substance in red blood cells which carries oxygen
  11. 19. a breath in
  12. 20. a breath out
Down
  1. 1. alternatie entry point for inhalation
  2. 3. what are the alveoli covered with
  3. 5. a tissue type where respiration occurs continually
  4. 6. entry point of air into body
  5. 8. the waste product of respiration
  6. 11. sheet of muscle that contracts to expand chest cavity
  7. 12. a product of respiration
  8. 14. first part of airway where inhaled air passes